The expression of PsdR influences QS activity.

PlasR-GFP (A), PrhlA-GFP (B) and PpqsA-GFP (C) reporter plasmids were mobilized into target strains. Strains bearing reporters were grown in casamino acids medium at 37°C. The expression level of GFP in each strain was quantified using a microreader and reported as relative fluorescence units divided by OD₆₀₀. WT, wild-type PAO1; ΔpsdR, PsdR-null mutant; ΔpsdR::PrrnB::psdR, PsdR-null mutant carrying a single copy of psdR driven by a rrnB promoter. Data of indicated strains are presented as mean ± SD (n ≧ 4).

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